Electric power verification non-contact anti-electricity-stealing detection method and system

Abstract

The invention discloses an electric power verification non-contact anti-electricity-stealing detection method and system, and relates to the technical field of electric power detection, and the method comprises the steps: collecting a voltage signal and a current signal of a to-be-detected electric power circuit through a portable voltage non-contact anti-electricity-stealing detector non-contact voltage clamp and a portable voltage non-contact anti-electricity-stealing detector non-contact current clamp; performing real-time harmonic analysis on the collected current signal to obtain a harmonic component effective value and a fundamental current effective value; performing dynamic error correction on the current measurement value according to the effective value of the harmonic component and the effective value of the fundamental current; the actual electric energy error of the electric energy meter is determined according to the voltage value and the corrected current value, and whether the electricity stealing behavior exists or not is judged based on the actual electric energy error, so that the harmonic component condition caused by the power grid environment can be overcome, and harmonic waves caused by the electricity stealing load can be accurately identified and identified; the electricity larceny recognition efficiency and precision are improved, and meanwhile the high quality and high precision of current data are guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power detection, and in particular to a power verification non-contact anti-electricity-stealing detection method and system. BACKGROUND

[0002] At present, in the field of electric power marketing, electricity stealing behavior causes huge electric energy loss and operating income loss, therefore, efficiently and accurately discovering and identifying electricity stealing behavior is an important work of power grid enterprises. The existing anti-electricity-stealing detection technology mainly relies on on-site calibrators to check the error of electric energy metering devices and check the wiring. The traditional on-site calibrator usually adopts a direct contact measurement method, that is, the voltage test line must be directly connected to the voltage terminal of the electric energy meter, and the current clamp is clamped in the current loop. This method has many disadvantages: first, the operation process is tedious and time-consuming, and it is necessary to open the metering box, remove the lead seal, and even open the meter cover, which not only reduces the work efficiency, but also easily causes safety accidents due to improper operation; second, in the process of contact connection, the original electricity stealing state of the user may be changed, which makes it impossible to capture the real electricity stealing evidence, and brings difficulties to the electricity stealing investigation work.

[0003] In recent years, non-contact measurement technology has begun to be applied to the field of electricity inspection. This kind of device measures voltage by inducting electric field through non-contact voltage clamp, and measures current through current clamp, which realizes preliminary inspection without opening the meter cover and removing the lead seal, greatly improving the convenience and safety of inspection. However, the existing non-contact detection method still has significant technical bottlenecks, which restrict its detection accuracy and reliability. The actual power grid environment is not an ideal power frequency sine wave, but there are a large number of harmonic components. Nonlinear electricity stealing loads (such as private rectifier devices) themselves will produce serious harmonics. The existing non-contact detector usually only performs fundamental wave analysis or simple true effective value calculation, and cannot effectively strip the influence of harmonic components on current measurement, resulting in deviation of current effective value measurement, and further distorting the subsequent electric energy error calculation, which may miss the behavior based on harmonic electricity stealing or produce misjudgment. SUMMARY

[0004] In view of the above problems, the present application provides a power verification non-contact anti-electricity-stealing detection method and system to solve the problem that the existing non-contact detector usually only performs fundamental wave analysis or simple true effective value calculation, and cannot effectively strip the influence of harmonic components on current measurement, resulting in deviation of current effective value measurement, and further distorting the subsequent electric energy error calculation, which may miss the behavior based on harmonic electricity stealing or produce misjudgment.

[0005] A power verification non-contact anti-electricity-stealing detection method, comprising the following steps: The voltage signal and the current signal of the power line to be measured are collected by the non-contact voltage clamp and the current clamp of the portable voltage non-contact anti-electricity-stealing detector respectively; The current signal collected is analyzed in real time to obtain the effective value of the harmonic component and the effective value of the fundamental wave current; The current measurement value is dynamically error-corrected according to the effective value of the harmonic component and the effective value of the fundamental wave current; The actual electric energy error of the electric energy meter is determined according to the voltage value and the corrected current value, and whether there is electricity stealing behavior is judged based on the actual electric energy error.

[0006] Preferably, the voltage signal and the current signal of the power line to be measured are collected by the non-contact voltage clamp and the current clamp of the portable voltage non-contact anti-electricity-stealing detector respectively, comprising: The circuit load parameter of the circuit to be measured is detected, and whether the circuit to be measured is in a low load state is determined according to the circuit load parameter; If yes, the portable voltage non-contact anti-electricity-stealing detector is switched to a high-precision current and voltage range, and the voltage signal and the current signal of the power line to be measured are collected by the non-contact voltage clamp and the current clamp respectively; The temperature data of the environment where the power line to be measured is located and the clamp closing state data in the current data collection process are detected; The current data is temperature drift compensated and contact resistance compensated according to the environmental temperature data and the clamp closing state data, and the compensated current data is obtained.

[0007] Preferably, the current signal collected is analyzed in real time to obtain the effective value of the harmonic component and the effective value of the fundamental wave current, comprising: The current signal is processed by removing the direct current component and windowing to obtain a multi-window discrete current signal sequence, and the signal frequency spectrum is obtained by performing FFT transformation on each window discrete current signal sequence; The power grid fundamental wave frequency of the power line to be measured is determined, and the fundamental wave spectral line and the multiple harmonic spectral lines are extracted from the signal frequency spectrum based on the power grid fundamental wave frequency; The fundamental wave spectral line and the multiple harmonic spectral lines are analyzed to determine the effective value of the fundamental wave current and the effective value of each harmonic current; The effective value of each harmonic component is calculated according to the effective value of the fundamental wave current and the effective value of each harmonic current.

[0008] Preferably, the current measurement value is dynamically error-corrected according to the effective value of the harmonic component and the effective value of the fundamental wave current, comprising: The current waveform distortion rate is calculated based on the effective value of each harmonic component and the effective value of the fundamental wave current, and it is determined whether the current waveform distortion rate is greater than or equal to a preset threshold; If yes, it is determined that the current measurement value has error and needs to be dynamically error corrected, and if no, it is determined that the current measurement value has no error and needs no dynamic error correction; The current filtering compensation correction value is calculated according to the current measurement value and the current waveform distortion rate: ; Wherein, is the current filtering compensation correction value, is the current measurement value, is the current waveform distortion rate.

[0009] Preferably, the actual electric energy error of the electric energy meter is determined according to the voltage value and the corrected current value, whether there is electricity stealing behavior is judged based on the actual electric energy error, and the method comprises the following steps: The standard electric energy value of the electric energy meter is calculated according to the voltage value and the corrected current value, and the meter electric energy value of the electric energy meter is collected by pulse sampling method; The actual electric energy error is calculated according to the standard electric energy value and the meter electric energy value, and the numerical property of the actual electric energy error is determined, the numerical property comprising: positive value and negative value; If the numerical property is a significant negative value, it is preliminarily determined that there is electricity stealing behavior, and if the numerical property is a positive value, it is determined that there is no electricity stealing behavior; The line checking function of the portable voltage non-contact anti-electricity-stealing detector is started to check the lines of the electric energy meter, and the reading test function is started to read the historical event records in the electric energy meter; The wiring conclusion is obtained according to the checking result, the abnormal event records are obtained according to the reading result, and the existence of electricity stealing behavior is further determined according to the wiring conclusion and the abnormal event records.

[0010] A power verification non-contact anti-electricity-stealing detection system, comprising: The acquisition module is used for collecting the voltage signal and the current signal of the to-be-detected power line by the non-contact voltage clamp and the current clamp of the portable voltage non-contact anti-electricity-stealing detector respectively; The analysis module is used for performing real-time harmonic analysis on the collected current signal to obtain the harmonic component effective value and the fundamental wave current effective value; The correction module is used for dynamically correcting the current measurement value according to the harmonic component effective value and the fundamental wave current effective value; The judgment module is used for determining the actual electric energy error of the electric energy meter according to the voltage value and the corrected current value, and judging whether there is electricity stealing behavior based on the actual electric energy error.

[0011] Preferably, the acquisition module comprises: The charge state judgment sub-module is used for detecting the circuit load parameter of the to-be-detected circuit, and judging whether the to-be-detected circuit is in a low load state according to the circuit load parameter. a voltage current signal acquisition sub-module, configured to switch the portable voltage non-contact electricity stealing detection instrument to a high-precision current voltage range and acquire voltage signals and current signals of the power line to be detected through the non-contact voltage clamp and the current clamp, if so; a jaw state detection sub-module, configured to detect temperature data of an environment where the power line to be detected is located and jaw closed state data in the current data acquisition process; a current compensation sub-module, configured to perform temperature drift compensation and contact resistance compensation on the current data according to the temperature data of the environment and the jaw closed state data, and acquire compensated current data.

[0012] Preferably, the analysis module comprises: a current signal sequence acquisition sub-module, configured to acquire a plurality of window discrete current signal sequences by performing DC component removal and windowing processing on the current signal, and perform FFT transformation on each window discrete current signal sequence to acquire signal frequency spectrum; a frequency spectrum line extraction sub-module, configured to determine a power grid fundamental frequency of the power line to be detected, and extract fundamental frequency spectrum lines and multiple harmonic frequency spectrum lines from the signal frequency spectrum based on the power grid fundamental frequency; a current effective value analysis sub-module, configured to analyze the fundamental frequency spectrum lines and the multiple harmonic frequency spectrum lines to determine a fundamental current effective value and a harmonic current effective value of each order; a harmonic component effective value calculation sub-module, configured to calculate a harmonic component effective value of each order according to the fundamental current effective value and the harmonic current effective value of each order.

[0013] Preferably, the correction module comprises: a current waveform distortion rate determination sub-module, configured to calculate a current waveform distortion rate based on the harmonic component effective value of each order and the fundamental current effective value, and determine whether the current waveform distortion rate is greater than or equal to a preset threshold value; an error correction determination sub-module, configured to determine that the current measurement value has an error and needs to be dynamically error corrected, if the current waveform distortion rate is greater than or equal to the preset threshold value, and determine that the current measurement value has no error and does not need to be dynamically error corrected, if the current waveform distortion rate is less than the preset threshold value; a current filtering compensation correction value calculation sub-module, configured to calculate a current filtering compensation correction value according to the current measurement value and the current waveform distortion rate: ; wherein, is the current filtering compensation correction value, is the current measurement value, is the current waveform distortion rate.

[0014] Preferably, the judgment module comprises: The standard electric energy value calculation submodule is used for calculating the standard electric energy value of the electric energy meter according to the voltage value and the corrected current value, and the metering electric energy value of the electric energy meter is collected by the pulse sampling method. The numerical property determination submodule is used for calculating the actual electric energy error according to the standard electric energy value and the metering electric energy value, and determining the numerical property of the actual electric energy error, wherein the numerical property includes a positive value and a negative value. The electricity stealing behavior determination submodule is used for preliminarily determining that the electricity stealing behavior exists if the numerical property is a significant negative value, and determining that the electricity stealing behavior does not exist if the numerical property is a positive value. The function starting submodule is used for starting the line detection function of the portable voltage non-contact anti-electricity stealing detection instrument to perform the line inspection on the electric energy meter, and simultaneously starting the reading meter test function to read the historical event record in the electric energy meter. The electricity stealing behavior secondary determination submodule is used for obtaining the wiring conclusion according to the inspection result, obtaining the abnormal event record according to the reading result, and further determining that the electricity stealing behavior exists according to the wiring conclusion and the abnormal event record.

[0015] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by means of the structure particularly pointed out in the written description and the accompanying drawings.

[0016] The technical solutions of the present application will be further described in detail below with the help of the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present application, and constitute a part of the specification, and are used to explain the present application together with the embodiments of the present application, and do not constitute a limitation on the present application.

[0018] Figure 1 A work flow diagram of the electric power verification non-contact anti-electricity stealing detection method provided by the present application; Figure 2 Another work flow diagram of the electric power verification non-contact anti-electricity stealing detection method provided by the present application; Figure 3 A structural schematic diagram of the electric power verification non-contact anti-electricity stealing detection system provided by the present application; Figure 4 A structural schematic diagram of the acquisition module in the electric power verification non-contact anti-electricity stealing detection system provided by the present application. DETAILED DESCRIPTION

[0019] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless indicated otherwise. The following exemplary embodiments described therein represent the best known uses of the present disclosure. However, the exemplary embodiments are merely examples of apparatuses and methods in accordance with some aspects of the present disclosure as detailed in the appended claims.

[0020] A power verification non-contact anti-electricity-stealing detection method, as shown in the accompanying drawings, comprises the following steps: Figure 1 Step S101, collecting voltage signals and current signals of a power line to be measured by a non-contact voltage clamp and a current clamp of a portable voltage non-contact anti-electricity-stealing detection instrument; Step S102, performing real-time harmonic analysis on the collected current signals to obtain harmonic component effective values and fundamental current effective values; Step S103, performing dynamic error correction on the current measurement values according to the harmonic component effective values and the fundamental current effective values; Step S104, determining actual electric energy errors of an electric energy meter according to the voltage values and the corrected current values, and judging whether there is electricity stealing behavior based on the actual electric energy errors.

[0021] The working principle of the above technical solution is as follows: voltage signals and current signals of a power line to be measured are collected by a non-contact voltage clamp and a current clamp of a portable voltage non-contact anti-electricity-stealing detection instrument; real-time harmonic analysis is performed on the collected current signals to obtain harmonic component effective values and fundamental current effective values; dynamic error correction is performed on the current measurement values according to the harmonic component effective values and the fundamental current effective values; actual electric energy errors of an electric energy meter are determined according to the voltage values and the corrected current values, and whether there is electricity stealing behavior is judged based on the actual electric energy errors.

[0022] The above technical solution has the beneficial effects that: by determining the harmonic component effective values and the fundamental current effective values to perform error correction on the current measurement values, the influence of harmonic components in the power grid environment can be overcome, and the harmonic caused by electricity stealing loads can be accurately identified and identified, thereby improving the electricity stealing identification efficiency and accuracy and ensuring the high quality and high precision of the current data, solving the problem that the existing non-contact detectors in the background technology can only perform fundamental wave analysis or simple true effective value calculation, cannot effectively separate the influence of harmonic components on current measurement, and cause deviation in current effective value measurement, thereby distorting the subsequent electric energy error calculation and possibly missing the behavior of stealing electricity based on harmonics or causing misjudgment.

[0023] In one embodiment, as shown in the accompanying drawings, Figure 2 ​As shown, the non-contact voltage clamp and the current clamp of the portable voltage non-contact anti-stealing electricity detector are used to collect the voltage signal and the current signal of the power circuit to be detected, including: In step S201, the circuit load parameter of the circuit to be detected is detected, and whether the circuit to be detected is in a low load state is determined according to the circuit load parameter. In step S202, if yes, the portable voltage non-contact anti-stealing electricity detector is switched to a high-precision current and voltage range, and the non-contact voltage clamp and the current clamp are used to collect the voltage signal and the current signal of the power circuit to be detected. In step S203, the temperature data of the environment where the power circuit to be detected is located and the clamp closing state data in the current data collection process are detected. In step S204, the current data is compensated for temperature drift and contact resistance according to the environment temperature data and the clamp closing state data, and the compensated current data is obtained.

[0024] In this embodiment, the low load state is represented as a load current < 5% rated current. In this embodiment, the high-precision current and voltage range can be: the current range is switched to 0-10A, and the voltage range is switched to 0-300V. The above technical scheme has the beneficial effects that: by judging whether the power circuit to be detected is in a low load state and then switching the high-precision current and voltage range of the detector, high-precision current data detection can be realized, small current measurement errors can be avoided, data accuracy and high quality are ensured, further, by compensating for the detected current data, the interference of environmental factors and detection medium factors can be avoided, thereby further ensuring the high quality of the data, laying a foundation for subsequent current error correction and stealing electricity behavior judgment, and further improving the practicality.

[0025] In this embodiment, the circuit load parameter of the circuit to be detected is detected, and whether the circuit to be detected is in a low load state is determined according to the circuit load parameter, including: The load current of the circuit to be detected is collected by a high-frequency sampling current sensor, and the instantaneous waveform thereof is determined, and the current true effective value and the current peak factor are determined according to the instantaneous waveform; The voltage parameter of the circuit to be detected is collected by a high-frequency sampling voltage sensor, and the instantaneous active power, the instantaneous reactive power, the apparent power and the power factor of the circuit to be detected are synchronously calculated in combination with the load current; The thermodynamic parameters and the electromagnetic radiation parameters of the circuit to be detected are synchronously collected by a distributed digital temperature sensor and a near-field magnetic field probe; The electrical characteristics are extracted according to the current true effective value and the current peak factor and the instantaneous active power, the instantaneous reactive power, the apparent power and the power factor of the circuit to be detected, the thermodynamic characteristics are extracted according to the thermodynamic parameters, and the electromagnetic characteristics are extracted according to the electromagnetic radiation parameters. The electrical characteristics, thermodynamic characteristics and electromagnetic characteristics are spliced under a unified timestamp to generate a current comprehensive load characteristic vector; A standard comprehensive load characteristic vector of the to-be-tested circuit running a complete working cycle in a normal healthy state is collected; A Gaussian mixture model is used to learn the standard load characteristic vector, and a dynamic baseline model of the to-be-tested circuit in various normal load states is established; The current load rate threshold, current state probability distribution deviation and current feature contradiction of the to-be-tested circuit are output based on the current comprehensive load characteristic vector through the dynamic baseline model; Multi-criteria fusion decision is made based on the current load rate threshold, current state probability distribution deviation and current feature contradiction to distinguish between normal light load and abnormal low load state.

[0026] In the embodiment, the multi-criteria fusion decision logic is as follows: Criterion 1: The current load rate threshold is less than a preset extremely low load threshold; Criterion 2: The current state probability distribution deviation is located in the probability interval of the abnormal state distribution; Criterion 3: The current feature contradiction is that the thermal balance deviation is greater than a preset threshold and the power is very low.

[0027] The above technical solution has the beneficial effects of constructing a multi-dimensional, adaptive and intelligent detection framework, realizing high-precision and high-reliability identification of the low load state of the circuit, especially the abnormal low load state, ensuring high precision and reliability of the determination result, providing effective reference conditions for subsequent selection of data collection modes, and further improving the practicality and stability.

[0028] In one embodiment, the real-time harmonic analysis of the collected current signal to obtain the harmonic component effective value and the fundamental current effective value includes: The current signal is subjected to DC component removal and windowing processing to obtain a plurality of window discrete current signal sequences, and FFT transformation is performed on each window discrete current signal sequence to obtain a signal spectrum; The power grid fundamental frequency of the to-be-tested power line is determined, and the fundamental spectral line and multiple harmonic spectral lines are extracted from the signal spectrum based on the power grid fundamental frequency; The fundamental spectral line and the multiple harmonic spectral lines are analyzed to determine the fundamental current effective value and the harmonic current effective values of each order; The harmonic component effective values of each order are calculated according to the fundamental current effective value and the harmonic current effective values of each order.

[0029] The beneficial effects of the above technical solutions are: by judging the effective value of harmonic components, it can be initially identified whether there is a problem of abnormal increase of certain specific harmonic components caused by tampering with CT, which lays a condition for subsequent identification of electricity stealing behavior, further, it can also provide accurate data input for subsequent power error compensation, so that the real power error can still be accurately calculated in a complex harmonic environment, the electricity stealing behavior through harmonic means can be accurately identified, and the practicality is further improved.

[0030] In one embodiment, the dynamic error correction of the current measurement value according to the effective value of the harmonic component and the effective value of the fundamental wave current comprises: calculating the current waveform distortion rate based on the effective value of each harmonic component and the effective value of the fundamental wave current, and determining whether the current waveform distortion rate is greater than or equal to a preset threshold value; If yes, it is determined that the current measurement value has an error and needs to be dynamically corrected, and if no, it is determined that the current measurement value has no error and does not need to be dynamically corrected; calculating a current filtering compensation correction value according to the current measurement value and the current waveform distortion rate: ; wherein, is the current filtering compensation correction value, is the current measurement value, is the current waveform distortion rate.

[0031] In this embodiment, the current waveform distortion rate is calculated by the following formula: ; wherein, is the effective value of the fundamental wave current, H is the number of occurrences of the effective value of the harmonic component, and i is the i-th occurrence of the effective value of the harmonic component, is the i-th effective value of the harmonic component; The beneficial effects of the above technical solutions are: by dynamically compensating and correcting according to the current waveform distortion rate, the accurate current value not affected by the harmonic interference can be calculated under the premise of determining the influence of the current harmonic distortion, thereby providing accurate data for subsequent power error calculation and improving stability.

[0032] In one embodiment, the actual power error of the electric energy meter is determined according to the voltage value and the corrected current value, and whether there is electricity stealing behavior is determined based on the actual power error, comprising: calculating the standard electric energy value of the electric energy meter according to the voltage value and the corrected current value, and collecting the meter electric energy value of the electric energy meter by pulse sampling method; According to the standard electric energy value and the meter electric energy value, the actual electric energy error is calculated, and a numerical attribute of the actual electric energy error is determined, the numerical attribute including: a positive value and a negative value; If the numerical attribute is a significant negative value, it is preliminarily determined that there is electricity stealing behavior, and if the numerical attribute is a positive value, it is determined that there is no electricity stealing behavior; The line checking function of the portable voltage non-contact anti-stealing electricity detector is started to check the wiring of the electric energy meter, and the reading test function is started to read the historical event record in the electric energy meter; According to the checking result, a wiring conclusion is obtained, according to the reading result, an abnormal event record is obtained, and according to the wiring conclusion and the abnormal event record, it is further determined that there is electricity stealing behavior.

[0033] In this embodiment, the significant negative value is represented as the actual electric energy error being less than a preset negative threshold, for example: the actual electric energy error <-2% is regarded as a significant negative value; In this embodiment, the wiring checking of the electric energy meter by the line checking function is specifically: judging whether the wiring is abnormal through phase angle detection and voltage and current phase difference analysis, which should be 0° in normal, and 180° or other abnormal angles in abnormal; In this embodiment, the historical event record type includes but is not limited to: electric energy meter cover opening record, voltage loss record, current reverse record, etc.

[0034] The beneficial effects of the above technical solution are: judging whether there is electricity stealing behavior according to the electric energy error data attribute can quickly determine whether there is electricity stealing behavior according to the principle that the quotient value between the meter electric energy and the actual electric energy is negative, which improves the judgment efficiency, and further, the electricity stealing behavior is comprehensively evaluated by combining the historical abnormal events of the electric energy meter and the wiring checking result, which improves the evaluation reliability and accuracy.

[0035] In one embodiment, the present embodiment also discloses a power verification non-contact anti-stealing electricity detection system, as shown in Figure 3 The system comprises: The acquisition module 301 is used for acquiring the voltage signal and the current signal of the power line to be measured by the non-contact voltage clamp and the current clamp of the portable voltage non-contact anti-stealing electricity detector respectively; The analysis module 302 is used for performing real-time harmonic analysis on the acquired current signal to obtain the harmonic component effective value and the fundamental wave current effective value; The correction module 303 is used for performing dynamic error correction on the current measurement value according to the harmonic component effective value and the fundamental wave current effective value; The judgment module 304 is used for determining the actual electric energy error of the electric energy meter according to the voltage value and the corrected current value, and judging whether there is electricity stealing behavior based on the actual electric energy error.

[0036] The working principle and beneficial effects of the technical solution have been described in the method embodiment, and will not be repeated here.

[0037] In one embodiment, as shown in Figure 4 The acquisition module 301 comprises: The charge state judgment sub-module 3011 is configured to detect the circuit load parameter of the to-be-tested circuit, and determine whether the to-be-tested circuit is in a low load state according to the circuit load parameter. The voltage and current signal acquisition sub-module 3012 is configured to, if so, switch the portable voltage non-contact electricity stealing detection instrument to a high-precision current voltage range, and acquire the voltage signal and the current signal of the to-be-tested power line through the non-contact voltage clamp and the current clamp, respectively. The clamp state detection sub-module 3013 is configured to detect the temperature data of the environment where the to-be-tested power line is located and the clamp closing state data in the current data acquisition process. The current compensation sub-module 3014 is configured to perform temperature drift compensation and contact resistance compensation on the current data according to the environmental temperature data and the clamp closing state data, and obtain compensated current data.

[0038] In one embodiment, the analysis module comprises: The current signal sequence acquisition sub-module is configured to acquire a plurality of window discrete current signal sequences by performing DC component removal and windowing processing on the current signal, and perform FFT transformation on each window discrete current signal sequence to obtain a signal spectrum. The spectrum line extraction sub-module is configured to determine the power grid fundamental frequency of the to-be-tested power line, and extract the fundamental spectrum line and the multiple harmonic spectrum lines from the signal spectrum based on the power grid fundamental frequency. The current effective value analysis sub-module is configured to analyze the fundamental spectrum line and the multiple harmonic spectrum lines to determine the fundamental current effective value and the harmonic current effective values. The harmonic component effective value calculation sub-module is configured to calculate the harmonic component effective values according to the fundamental current effective value and the harmonic current effective values.

[0039] In one embodiment, the correction module comprises: The current waveform distortion rate determination sub-module is configured to calculate the current waveform distortion rate based on the harmonic component effective values and the fundamental current effective value, and determine whether the current waveform distortion rate is greater than or equal to a preset threshold. The error correction determination sub-module is configured to, if so, determine that the current measurement value has an error and needs to be dynamically error corrected, and if not, determine that the current measurement value has no error and does not need to be dynamically error corrected. The current filtering compensation correction value calculation sub-module is configured to calculate the current filtering compensation correction value according to the current measurement value and the current waveform distortion rate. ; wherein, is expressed as a current filter compensation correction value, is expressed as a current measurement value, is expressed as a current waveform distortion rate.

[0040] In one embodiment, the judging module comprises: a standard electric energy value calculation sub-module, configured to calculate a standard electric energy value of the electric energy meter according to the voltage value and the corrected current value, and to collect a meter electric energy value of the electric energy meter by a pulse sampling method; a numerical property determination sub-module, configured to calculate an actual electric energy error according to the standard electric energy value and the meter electric energy value, and to determine a numerical property of the actual electric energy error, the numerical property comprising: a positive value and a negative value; a electricity stealing behavior determination sub-module, configured to preliminarily determine that there is electricity stealing behavior if the numerical property is a significant negative value, and to determine that there is no electricity stealing behavior if the numerical property is a positive value; a function starting sub-module, configured to start a line checking function of the portable voltage non-contact electricity stealing detection instrument to perform line checking on the electric energy meter, and to start a reading meter test function to read historical event records in the electric energy meter; a electricity stealing behavior secondary determination sub-module, configured to obtain a wiring conclusion according to the checking result, to obtain abnormal event records according to the reading result, and to further determine that there is electricity stealing behavior according to the wiring conclusion and the abnormal event records.

[0041] It should be understood by those skilled in the art that the first and second in the present application refer to different application stages.

[0042] Other embodiments of the present disclosure will be readily apparent to those skilled in the art upon considering the specification and practice of the disclosure disclosed herein. The present application is intended to cover any variations, uses or adaptive changes of the present disclosure that follow the general principles of the present disclosure and include common knowledge or conventional technical means in the art that are not disclosed by the present disclosure. The specification and examples are only regarded as exemplary, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0043] It should be understood that the present disclosure is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A non-contact anti-electricity theft detection method for electricity verification, characterized in that, Includes the following steps: The voltage and current signals of the power line under test are collected by a portable non-contact voltage clamp and a current clamp, respectively, using a portable non-contact voltage anti-theft detector. Real-time harmonic analysis is performed on the acquired current signal to obtain the effective values ​​of harmonic components and the effective value of the fundamental current. Dynamic error correction is performed on the current measurement value based on the effective values ​​of harmonic components and the effective value of fundamental current. The actual energy error of the energy meter is determined by comparing the voltage value with the corrected current value, and the existence of electricity theft is determined based on the actual energy error.

2. The non-contact anti-electricity theft detection method for power verification according to claim 1, characterized in that, The method involves using a portable non-contact voltage clamp and current clamp to collect voltage and current signals of the power line under test, respectively, through a portable non-contact voltage anti-theft detector. Detect the circuit load parameters of the circuit under test, and determine whether the circuit under test is in a low load state based on the circuit load parameters; If so, switch the portable non-contact voltage anti-theft detector to the high-precision current and voltage range and collect the voltage and current signals of the power line under test through the non-contact voltage clamp and current clamp respectively. The clamp closure status data during the acquisition of temperature and current data of the environment where the power line under test is located is detected. Temperature drift compensation and contact resistance compensation are performed on the current data based on ambient temperature data and jaw closure status data to obtain the compensated current data.

3. The non-contact anti-electricity theft detection method for power verification according to claim 1, characterized in that, The real-time harmonic analysis of the acquired current signal to obtain the effective values ​​of harmonic components and the effective value of the fundamental current includes: The current signal is processed by removing the DC component and windowing to obtain a multi-window discrete current signal sequence. The discrete current signal sequence of each window is then subjected to FFT transformation to obtain the signal spectrum. Determine the fundamental frequency of the power grid for the power line under test, and extract the fundamental frequency spectrum line and multiple harmonic frequency spectrum lines from the signal spectrum based on the fundamental frequency of the power grid. The fundamental frequency spectrum and the multiple harmonic frequency spectrum are analyzed to determine the effective value of the fundamental current and the effective value of each harmonic current. The effective values ​​of each harmonic component are calculated based on the effective value of the fundamental current and the effective values ​​of each harmonic current.

4. The non-contact anti-electricity theft detection method for power verification according to claim 1, characterized in that, The dynamic error correction of the current measurement value based on the effective values ​​of harmonic components and the effective value of the fundamental current includes: The current waveform distortion rate is calculated based on the effective values ​​of each harmonic component and the effective value of the fundamental current, and it is determined whether the current waveform distortion rate is greater than or equal to a preset threshold. If yes, it indicates that there is an error in the current measurement value, and dynamic error correction is required; otherwise, it indicates that there is no error in the current measurement value, and dynamic error correction is not required. The current filter compensation correction value is calculated based on the measured current value and the current waveform distortion rate: ； in, This is represented as the current filter compensation correction value. Represented as current measurement value, It is expressed as the current waveform distortion rate.

5. The non-contact anti-electricity theft detection method for power verification according to claim 1, characterized in that, The process of determining the actual energy error of the energy meter based on the voltage value and the corrected current value, and judging whether electricity theft has occurred based on the actual energy error, includes: The standard energy value of the energy meter is calculated based on the voltage value and the corrected current value, and the meter energy value is collected by the pulse sampling method. The actual energy error is calculated based on the standard energy value and the meter energy value, and the numerical attributes of the actual energy error are determined, including positive and negative values. If the numerical attribute is significantly negative, it is preliminarily determined that there is electricity theft; if the numerical attribute is positive, it is determined that there is no electricity theft. The portable non-contact voltage anti-theft detector is activated to check the wiring of the electricity meter, and the meter reading test function is activated to read the historical event records inside the electricity meter. Based on the inspection results, obtain the wiring conclusions; based on the reading results, obtain the abnormal event records; and based on the wiring conclusions and abnormal event records, further determine that electricity theft has occurred.

6. A non-contact anti-electricity theft detection system for electricity verification, characterized in that, The system includes: The acquisition module is used to acquire the voltage and current signals of the power line under test through the non-contact voltage clamp and current clamp of the portable non-contact voltage anti-theft detector. The analysis module is used to perform real-time harmonic analysis on the acquired current signal to obtain the effective values ​​of harmonic components and the effective value of the fundamental current. The correction module is used to dynamically correct the error of the current measurement value based on the effective values ​​of the harmonic components and the effective value of the fundamental current. The judgment module is used to determine the actual energy error of the energy meter based on the voltage value and the corrected current value, and to determine whether there is any electricity theft based on the actual energy error.

7. The non-contact anti-electricity theft detection system according to claim 6, characterized in that, The acquisition module includes: The charge state determination submodule is used to detect the circuit load parameters of the circuit under test and determine whether the circuit under test is in a low load state based on the circuit load parameters. The voltage and current signal acquisition submodule is used to switch the portable non-contact voltage anti-theft detector to the high-precision current and voltage range and acquire the voltage and current signals of the power line under test through non-contact voltage clamp and current clamp respectively. The jaw status detection submodule is used to detect the jaw closure status data during the acquisition of temperature and current data of the environment where the power line under test is located. The current compensation submodule is used to perform temperature drift compensation and contact resistance compensation on the current data based on ambient temperature data and jaw closure status data, and obtain the compensated current data.

8. The non-contact anti-electricity theft detection system according to claim 6, characterized in that, The analysis module includes: The current signal sequence acquisition submodule is used to perform DC component removal and windowing processing on the current signal to obtain a multi-window discrete current signal sequence, and to perform FFT transformation on each window discrete current signal sequence to obtain the signal spectrum; The spectrum line extraction submodule is used to determine the fundamental frequency of the power grid of the power line under test, and extract the fundamental frequency spectrum line and multiple harmonic frequency spectrum lines from the signal spectrum based on the fundamental frequency of the power grid. The current RMS value analysis submodule is used to analyze the fundamental frequency spectrum line and the multiple harmonic frequency spectrum lines to determine the RMS value of the fundamental current and the RMS value of each harmonic current. The harmonic component RMS value calculation submodule is used to calculate the RMS value of each harmonic component based on the RMS value of the fundamental current and the RMS values ​​of each harmonic current.

9. The non-contact anti-electricity theft detection system according to claim 6, characterized in that, The correction module includes: The current waveform distortion rate determination submodule is used to calculate the current waveform distortion rate based on the effective values ​​of each harmonic component and the effective value of the fundamental current, and to determine whether the current waveform distortion rate is greater than or equal to a preset threshold. The error correction determination submodule is used to determine if there is an error in the current measurement value and dynamic error correction is required, and if not, to determine if there is no error in the current measurement value and dynamic error correction is not required. The current filter compensation correction value calculation submodule is used to calculate the current filter compensation correction value based on the current measurement value and the current waveform distortion rate. ； in, This is represented as the current filter compensation correction value. Represented as current measurement value, It is expressed as the current waveform distortion rate.

10. The non-contact anti-electricity theft detection system according to claim 6, characterized in that, The judgment module includes: The standard energy value calculation submodule is used to calculate the standard energy value of the energy meter based on the voltage value and the corrected current value, and to collect the meter energy value through the pulse sampling method. The numerical attribute determination submodule is used to calculate the actual energy error based on the standard energy value and the meter energy value, and to determine the numerical attribute of the actual energy error, which includes positive and negative values. The initial determination submodule for electricity theft is used to preliminarily determine the existence of electricity theft if the numerical attribute is significantly negative, and to determine the absence of electricity theft if the numerical attribute is positive. The function start submodule is used to start the wiring detection function of the portable voltage non-contact anti-theft electricity detector to check the wiring of the electricity meter, and at the same time start the meter reading test function to read the historical event records inside the electricity meter; The secondary determination submodule for electricity theft is used to obtain wiring conclusions based on inspection results, obtain abnormal event records based on reading results, and further determine the existence of electricity theft based on wiring conclusions and abnormal event records.

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